It did work back around 1.2-1.3, I used it to run Ultrix 4.5 
binaries.  But I haven't tried it since then.

-- Ragge

> Actually, I don't think that has ever worked.
> The Ultrix compat stuff is (I think) for the DECstations. Don't think it 
> has ever been worked over for VAX.
> 
> But I'm very unsure about this all. Never tried it myself...
> 
>  	Johnny
> 
> On Wed, 1 Mar 2006, A. Wik wrote:
> 
> > Has anyone tried running 4.3BSD or Ultrix 4.5 binaries
> > on NetBSD/vax 1.5.x?  Any known problems?
> >
> > Although the COMPAT option for 4.3BSD is enabled in my
> > kernel, all binaries I've tested so far have output some
> > garbage and exited.  The results were identical to a
> > preceding attempt with Ultrix compatibility, which
> > according to kernel config file comments cannot co-exist
> > with the 4.3 compat option).
> >
> > As for the executables, the file(1) utility suggests:
> >  # file bin/date
> >  bin/date: 386 demand paged pure executable not stripped
> >
> > Manual inspection does not confirm such findings.  For
> > example, /bin/sync (chosen for its small size) contains
> > the VAX instruction for a 4.3BSD sync(2) system call -
> > CHMK 36 - and then immediately checks the carry flag -
> > with BCS (== BLSSU) to determine whether it failed.
> >
> > Abbreviated output of objdump(1) follows:
> >
> > # objdump -b binary -m vax -D sync
> >
> > sync:     file format binary
> >
> > No symbols in "sync".
> > Disassembly of section .data:
> >
> > 00000000 <.data>:
> >       0:	0b 01 00 00 		crc	$1, $0, $0, $0
> >       4:	00
> >       5:	04          		ret
> >       6:	00          		halt
> >       7:	00          		halt
> >       8:	00          		halt
> >       9:	04          		ret
> >       a:	00          		halt
> >       b:	00          		halt
> >       c:	00          		halt
> >       d:	00          		halt
> >       e:	00          		halt
> >       f:	00          		halt
> >      10:	f0 00 00 00 		insv	$0, $0, $0, $0
> >      14:	00
> > ...
> >     470:	00          		halt
> >     471:	00          		halt
> >     472:	bc 24       		chmk	$36
> >     474:	1f f2       		blssu	0x468
> >     476:	04          		ret
> >
> >
>